1 /* Copyright (c) 2008-2017. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include <simgrid_config.h>
9 #include "src/mc/mc_base.h"
10 #include "src/mc/mc_replay.h"
11 #include "src/simix/smx_private.h"
14 #include "src/mc/ModelChecker.hpp"
16 using simgrid::mc::remote;
19 XBT_LOG_NEW_DEFAULT_CATEGORY(mc, "All MC categories");
21 int MC_random(int min, int max)
24 xbt_assert(mc_model_checker == nullptr);
26 /* TODO, if the MC is disabled we do not really need to make a simcall for this :) */
27 return simcall_mc_random(min, max);
33 void wait_for_requests()
36 xbt_assert(mc_model_checker == nullptr);
43 while (not xbt_dynar_is_empty(simix_global->process_to_run)) {
44 SIMIX_process_runall();
45 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
46 req = &process->simcall;
47 if (req->call != SIMCALL_NONE && not simgrid::mc::request_is_visible(req))
48 SIMIX_simcall_handle(req, 0);
52 xbt_dynar_reset(simix_global->actors_vector);
53 for (std::pair<aid_t, smx_actor_t> kv : simix_global->process_list) {
54 xbt_dynar_push_as(simix_global->actors_vector, smx_actor_t, kv.second);
59 /** @brief returns if there this transition can proceed in a finite amount of time
61 * It is used in the model-checker to not get into self-deadlock where it would execute a never ending transition.
63 * Only WAIT operations (on comm, on mutex, etc) can ever return false because they could lock the MC exploration.
64 * Wait operations are OK and return true in only two situations:
65 * - if the wait will succeed immediately (if both peer of the comm are there already or if the mutex is available)
66 * - if a timeout is provided, because we can fire the timeout if the transition is not ready without blocking in this transition for ever.
69 // Called from both MCer and MCed:
70 bool request_is_enabled(smx_simcall_t req)
72 // TODO, add support for the subtypes?
78 case SIMCALL_COMM_WAIT:
80 /* FIXME: check also that src and dst processes are not suspended */
81 simgrid::kernel::activity::CommImpl* act =
82 static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_wait__getraw__comm(req));
85 // Fetch from MCed memory:
87 if (mc_model_checker != nullptr) {
88 simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
89 mc_model_checker->process().read(temp_comm, remote(act));
90 act = static_cast<simgrid::kernel::activity::CommImpl*>(temp_comm.getBuffer());
94 if (simcall_comm_wait__get__timeout(req) >= 0) {
95 /* If it has a timeout it will be always be enabled, because even if the
96 * communication is not ready, it can timeout and won't block. */
97 if (_sg_mc_timeout == 1)
100 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
101 else if (act->detached && act->src_proc == nullptr
102 && act->type == SIMIX_COMM_READY)
103 return (act->dst_proc != nullptr);
104 return (act->src_proc && act->dst_proc);
107 case SIMCALL_COMM_WAITANY: {
109 simgrid::kernel::activity::CommImpl* act =
110 static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_wait__getraw__comm(req));
113 s_xbt_dynar_t comms_buffer;
114 size_t buffer_size = 0;
115 if (mc_model_checker != nullptr) {
117 mc_model_checker->process().read(
118 &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
119 assert(comms_buffer.elmsize == sizeof(act));
120 buffer_size = comms_buffer.elmsize * comms_buffer.used;
121 comms = &comms_buffer;
123 comms = simcall_comm_waitany__get__comms(req);
125 // Read all the dynar buffer:
126 char buffer[buffer_size];
127 if (mc_model_checker != nullptr)
128 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
129 remote(comms->data));
131 comms = simcall_comm_waitany__get__comms(req);
134 for (unsigned int index = 0; index < comms->used; ++index) {
136 // Fetch act from MCed memory:
138 simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
139 if (mc_model_checker != nullptr) {
140 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
141 mc_model_checker->process().read(temp_comm, remote(act));
142 act = static_cast<simgrid::kernel::activity::CommImpl*>(temp_comm.getBuffer());
146 act = xbt_dynar_get_as(comms, index, simgrid::kernel::activity::CommImpl*);
147 if (act->src_proc && act->dst_proc)
153 case SIMCALL_MUTEX_LOCK: {
154 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
156 simgrid::mc::Remote<simgrid::simix::MutexImpl> temp_mutex;
157 if (mc_model_checker != nullptr) {
158 mc_model_checker->process().read(temp_mutex.getBuffer(), remote(mutex));
159 mutex = temp_mutex.getBuffer();
163 if(mutex->owner == nullptr)
166 else if (mc_model_checker != nullptr) {
167 simgrid::mc::Process& modelchecked = mc_model_checker->process();
168 // TODO, *(mutex->owner) :/
169 return modelchecked.resolveActor(simgrid::mc::remote(mutex->owner))->pid ==
170 modelchecked.resolveActor(simgrid::mc::remote(req->issuer))->pid;
174 return mutex->owner->pid == req->issuer->pid;
177 case SIMCALL_SEM_ACQUIRE: {
178 static int warned = 0;
180 XBT_INFO("Using semaphore in model-checked code is still experimental. Use at your own risk");
185 case SIMCALL_COND_WAIT: {
186 static int warned = 0;
188 XBT_INFO("Using condition variables in model-checked code is still experimental. Use at your own risk");
194 /* The rest of the requests are always enabled */
199 bool request_is_visible(smx_simcall_t req)
201 return req->call == SIMCALL_COMM_ISEND
202 || req->call == SIMCALL_COMM_IRECV
203 || req->call == SIMCALL_COMM_WAIT
204 || req->call == SIMCALL_COMM_WAITANY
205 || req->call == SIMCALL_COMM_TEST
206 || req->call == SIMCALL_COMM_TESTANY
207 || req->call == SIMCALL_MC_RANDOM
208 || req->call == SIMCALL_MUTEX_LOCK
209 || req->call == SIMCALL_MUTEX_TRYLOCK
216 static int prng_random(int min, int max)
218 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
219 unsigned long input_size = (unsigned long) RAND_MAX + 1;
220 unsigned long reject_size = input_size % output_size;
221 unsigned long accept_size = input_size - reject_size; // module*accept_size
223 // Use rejection in order to avoid skew
227 x = (unsigned long) random();
229 x = (unsigned long) rand();
231 } while( x >= accept_size );
232 return min + (x % output_size);
235 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
237 if (not MC_is_active() && not MC_record_path)
238 return prng_random(min, max);
239 return simcall->mc_value;